Hydraulic pump.



J. W. NELsoN. HYDMULIG PUMP. on r LED rms. 7, 190s. Wwf I l Patented sept 22,1908.

.III-Illlllllllllb-IIIIII.

IN VE N 70B JAMES NELSON, OF KEW YORK, N. Y.

HYDRAULIC PUMP.

Specication'of Letters Patient.A

Patented Sept. 22, 1908.

Appiiaaon aiea February 7, isos. seria No. mess.

To all whom -t muy concern:

Be it-known that I, Jamas W. NELsox, a. citizen of the United States. and a resident of the city of New York, borough of Brooklyn, county of Kings, and State of New York, haveinvented certain-new and useful I1nprovenients in Hydraulic Pui'iips, of which .i

the following is a specification.

This invention relates to hydraulic pumps of the multiple-piston type, wherein two or more pistons are jointly operated for the purpose of forcing a greater volume of liquid to the point of final application of the pressure, all but one of. said pistons being rendered inoperative, wlien desired, for the purpose of increasing the power at a sacrilice of speed under thc well-known principles of hydrostatics.

The present invention contemplates a. multiple-piston pump in which all valves are verticallv acting and downwardly seating, as and for the purposes described by me in a copending application filed October 29, 1907, Serial No; 399,73). In the copending application aforesaid, I have shown and described the application of a similar inventive idea. to a. single-piston pump. ln4 providing the pump-block of a. singie-piston .pump with a separate valve-bore having, to facilitate manual control, all valves in superposed arrangement in said bore, no other passages iii saidlpump-block are necessary except one for su iplying li nid to said bore below the lower valve, one or delivering the liquid 'under pressure from said bore above the upper valve,- and one connecting thepump-chaniber with said bore at a point between the two valves-all of these'passages', ii'icluding the valve-bore, heilig straight throughout their entire length and therefore easily provided.-

Following out the same general system of valve controlasA shown and described b v nie in my Patent No. 874,698, dated December 24, 1907, it will be apparent that the addition of another piston to the pump shown and described in my copending application, aforesaid', will necessitate the addition of anothervalve in the valve-bore and an entirely diicrent arrangementv of the passages in the pumpblot-lt to supply liquid to and deliver liquid under pressure from the pump chambers in a mannerv to enable the joint or several use of the pumps. Furthermore', with the employment of dowinvardly-seating valves in a substantiallyv vertical valve-bore it will be apparent that the initial inlet. valvemust. be

the lowest valve and the largest pump, to which said valve checks baclellow, is---with a tandem arrangement' of pistons, which l prefer' to emplov-the upper` nnnp. Similarly, the final outlet valve must )c at the top, with `the puinpto `whichit ultimately checks backflow at the bottom. Such a' construction obviously renders necessary a very different arrangement of ducts connecting the pump chambers with the valve-bore, and the object of the present invention is the provision-of means wherebythe advantages of downwardLv-seating valves may be secured in a multiple-piston pump.

My invention will be more readily uiiderstood by referente to the accompanying dra\\'ings, forming a part of this specification, in which Figure 1 is a sectional elevation of adoublepiston pump embodying my invention, and F ig. 2 is a transverse central section through the pump-block.

Referring now to the drawings in det-ail, numeral 11 refers to-a suitable base, to one end of whichissecured the preierahlv cylindrical pump-block 12. This pump-block is provided with a central bore comprising an upper portion 13 of relatively larger diameter and a lower portion 14 of relatively smaller diameter. The lower end of this bore-isclosed, and into t-he upper end thereof projects the iston-rod 15 which is vertically reciprocated y means of the pump-lever 16, to 'which it is pivoted, said pump-lever being fulci'unied at 17 to the link 1S, pvoted in turn to the bracket 19 on th'.` standard 20.

Tli'e reciprocating piston-rod 15 is provided with the piston-head 11,iitting the'portixzn 13 ofthe pump-bore, from which head projects the supplemental pistonlrod l2 carrying at its end the piston-head 23 fitting the portion 14 of lthe pump-bore.

referably -pedient, and forms no part of the present. invention, it is not shown in the drawings. l

lhe pump-block 1'. is further providei'llwith a lateral bore 24, theA exterioreiul of which is 'scaled by means of e. scre\\"`pliig .Zfi'to forni mi interior chamber near the hase if said pumphlock. l This pump-block is in'ther provided with a vertical bore extendivf from the These pistons areV rovidedwith suitable parkings,y uit as this is a ycommon and well-known exchamber 24 to the top ol' said block, prefer ably paralleling the pumpbore, to one side of which it is located, the upper end thereof being sealed by means of the screw-plug '26.

i This bore comprises a loweiportion 27, the

diameterl of which is increased at 28 to provide a seat for the valve 29. `The widened above which the diameter of said bore is attain increased throughoutthe portion 33,

though, for the pur ose of again 'decreasing the effective area o saidl bore, I prefer to inouiit therein the removable valvelug 34, the top of which irov'ides a seat for t ie valve 3 5, which is pre eiably downwardly springpressed, as shown;

chan er 24, lduring operation of the ump from any suitable source of sup ly, suc vas a barrel or tank, from which lea s the preferably flexible pipe 36, which communicates, through a Asuitable cou Vling by means of which it is secured to tie pum -block 12,

with a duct 37 in said punip-b ook which leads to the chamber 24; From the up er end of the valve-bore, which is l{lireferai'ily again enlarged to rovide the sma chamber 38, leads. a late-ra duct 39-to the couplinnr or connection 40, to which may be secure any desired kind of ipe or hose suitable for the transmission of iquid under pressure to 1 the. oint of final application,

When the pistons of a double-piston type of pump or jack are located in tandeinarrangement-that is, when they are mounted u on a common iston-rod and operated in a inement-it will) be apparent that the piston'oi smaller diameter, and therefore the one for the generation of the ereatest pres! sure, must be loca-ted below the arger piston. Under ordinary conditions, the liquid is drawn into'the um chamber from above the' piston and orce o'itl through'suitable passages below said. istons. In the-present case, in order to avai myself of downwardl seating'valves, it is obvious that the liquid. must be drawn into the pump-chamber from points below the valves and discharged from points above the same.

In the s vsteiii'of valves in the arrangement shown and described by' me in my earlier patent aforesaid, a super osed arrangement of three valves norma ly render efl'ective the operations of both pumps, but which may be successively unseated, in order, for the purpose of, iirst, rendering the larger'puinp inoperative; second, rendering -both pumps inoperative; and, third, relieving the pressure in the rain or pressure chamber. These valves having common controlling means with connecting means therebetween for interde'peiidency in manual control', it willbe apparent that the valve nearest to said controlling means will be the irstafi'ected by operation of said means and, there- In the patentl Litiid-'iscontinuously supplied to thel and checks back-flow from the upper puin chamber.l In the present construction, t e valve nearest the source of sup ly, and

which should check back-iiow from t e upper ump-chamber, is -t-li'e lowest valve in the ore. It will therefore be ap iareiit, as here'- inbefore suggested, that for tlie present purposes a verv different arrangement of pas- .sages iiiiist be provided from that shown in .the 'earlier patent aforesaid.

To eiiectthe desiredl result, I- provide a lateral duct 41 leading from the portion 30 of the valve-bore between the valves 29 and 32, which duct comprises a vertical portion 42 and terminates in another lateral portion- 43 which leads into the bottom of the pump chamber 13.

From the portion 33 of the valvefbore above the valve 32 and below the valve 35 leads a lateral duct 44, having the vertical portion 45 and terminating in the lateral portion'46 which leads into the chamber 14 elow the lower and smaller pist-on. To provide for the manual control of these valves, I have shown the screw-plug 25 provided with the short shaft 47'centrally `ournaled therein, carrying at its inner end t e cam 4S, in cooperative. ositional relation to the end of the downwart y-projecting stein 49 of the valve 29. The outer end of the shaft 47 is provided with a head 50 which is turned by means of an operating lever 51 secured in said head. Said cam 48 is normally noninterferent with the automatic action of the valve 29. The valve 32 is similarly provided with a downwardly-projecting stem 52 which extends nearly -but under normal conditions not quite to the valve 29. The valve 35 is similarly provided with a downwardly-projecting stem-53, extending nearl but under normal conditions not quite to t e valve 32.

It will now be apparent that with the lever 51 in such positionthat the cani 48 is non? -iowing through the ducts 44, 45 and 46, to

the chamber 14 below the lower and smaller piston. .Upon the downstroke of said lever 16 and the pistons 2l and 23, the pressure of the liquid m the. upper and larger pump# chamber 13, in connection with the force of gravity, will seat the valve 28., this liquid being then forced past the valve 32, where it 'oins with th liquid from the'smaller and ower pump-chamber 14, and passes the esmas valve-35- on itsl'vay to the point 'of application.-

When it is' desired to render the larger pump inoperative, for purposes liereinbefore rietiy referred to, the lever 51 is turned through an are which causes the cam 4S to impinge against the stem 49 to raise the valve 29 and hold the saine oti' itsy seat, without, however, interferinfy with automatic actionof the Ivalve' 'fnder these conditions, upon the upstroke of the pistons. liquid will in the manner described be drawn into both pump-chambers, but upon'tlie down-stroke of said pistons, the valve 29 being held oi'i` its seat,liquid under ressure of the larger piston 21 will follow t ie path of least resistance and How back past said valve and through the portion 27 of the valve-bore to the source of su ply. The licuid lunder pressure of the smal er piston 23, iowever is forced into the valve-bore at a point above the valve 32, which retains all of its normal functions and which is, therefore, seat-ed under excessive, pressure from above the same in connection with the force of gravity. T he liquid from the smaller pump-chamber 14, therefore, ,will

. he forced through-the upper portion 33 of the valve-bore and past the valve 35 to the point of application of the pressure. -It is at times desirable, furthermore, to render both pum s inoperative without however, relieving t ie pressure wliich'is being applied. For this pur ose, the lever 51 is'turned through a slig itly greater are, operating through the cam 48 to still further raise the stem 49 of the valve 29 until the latter impinges against the er'id of the stein 52 of the valve 32 and unseatsaid valve 32, without, however, unseating the yvalve 35. It will no'w be a parent tliat operation iot both umps mere y cause the liquid to flow idlyT ack and forth, through the now. open passages, to and from the source of supply.

For the purpose of relieving the pressure at the point of applica-tion, it is only necessary to turn the lever-51"through a still greater arc,'rthe cam 48. operating,r through the valve-stenrto raise 'the valve 32 until it imliinges against the stein 53 of the valve 35 ani raises the latter oil its seat, thus opening a passage through said bore from the pipe leading to the points where the pressure is'v applied to the source ofliquid supply. .0b-

. viously, the lever 51 may be returned to anv Asaid pumps successively inoperative.

and valve-controlling means for rendering one of said pumps inoperative, said means the art to which itappertains, and I. therefore" do not desire to limit my invention to the 1 'irisiiiilr a iluralitv of )um is, a single assawe h n l* I* valved to noi'iiially cil'ect the flow from all pumps in an upward direction therethrough, and valve-controlling means for rendering one or more of said pumps inoperative.

3. .A hydraulic pressure geneiator coniprising a plurality of pumps. a single passage 85 valved to normally ell'cct the low from all I. pumps in an upward direction therethrough,

and valve-coutrolling means for rendering ont` or all ot' said pumps inoperative.

4. A hydraulic pressure -gciicrator comprising a plurality of pumps, a single passage 'alvc-d to normally cllcct the' Ilow from all pumps in an upward direction therethrough, and valve-controlling means for rende-ring 5. A hydraulic pressure generator coniprising a. plurality of pumps. a single passage 4valved to normally cti'cct the llow from all pumps in an upward direction therethrough,

heilig further operable to render more tha one of said 'pui'iips inoperative.. s 6. A hydraulic pressure generator com )risimY a iluralitv of )um s, a single assave h F n valved to normally ellect flow from al umps V in an upward' direction therethrougi, and valve-controlling means for rendering one of 'A said pumps inoperative, said means being further operable to render all ol' said pumps 110 inoperative.

7. A liif'draulic pressure generator coniprising a plurality of pumps, a single passage valved to. normally effect the flow from all pumps in an upward direction therethrough.

and valve-controlling means for rendering one of said pumps inoperative and for reliev- Qing Athe pressure at the point of 'application 8.v A iydraulic pressure generator comprisinga plurality of pumps, a single passage valvcd to 'normally ellcct the llow from all pumps in an upward direction therethrough, and valve-coutrolling iiiciiiis for rendering 'one 'or all of said puiiips inoperative and for relieving the tion.

9. A li 'draulic pressure generator coinprisiiig a plurality of pumps, a single passage valvcd to normally ctfcctthe low from all pumps in an upward direction therethrough,

pressure at the point` of iipplica- 1,25

` and valve-'contrqllinge means for rendering' 'one of said- ;puiiips 'inoperatives'aidmeans? being furthfei' operable torelieve the pressure at the point of application.

10. A liyd'i-'a-ulic valve'd to normally eti'ect tli`e .flow from all pumps in aiiupwai'd direction therethrough and valvescontrolling inea-'ns' for rendering one of said pumps inoperative, said moans lieing further operable to render all of said pumps inoperative and to relieve tlie pres-A sure at the oint of application.l

11. A liyii'aulic pressure generator comprising a plurality of pumps coperating with a series of downwardly-seating valves, andV means for rendering one of said valves inoperative.

12. 'A h Ydraulic ressure generator comprising a plurality o pumps coperating with a series of downwardly-seating valves, and means for rendering one'or more of said valves inoperative.

13. A hydraulic pressure generatorcomprising'a plurality of pumps coperatiiig with a seriesof downwardly-seating valves, and n'ieans for rendering one or all of said valves inoperative.

14. A hydraulic pressure generator coniprising a plurality of pumps coperating with a series of downWardly-seatin valves, and

' means for rendering one of sai valves inoperative, said means being further .operable to render all valves inoperative.

, 15. A hydraulic pressure generator coniprising a plurality of pumps coperating with a series of downwardlyseating valves, and

` means for unseating one of said valves, said means being further operable to successively unseat all of said valves.

16. A multiple-puinp hydraulic pressure generator provided 'with a series of down-v wardlyseating valves and means for unseating all valves by one operation.

17. A double-pump hydraulic pressure generator provided with a series of downwardly-seating valvesland means for unseating all valves by one operation.

18. A double-pump hydraulic pressure generator provided with a series of downwardly-seating lvalves and means acting upon one of said valves to unseat all thereof.

19. AA double-pump hydraulic pressure generator provided with a series of downwardly-seating valves and means acting upon one of said valves to unseat said valve only or all thereof. l

20. A multiplefpuinp hydraulic pressure generator provided 'with a series ol' downward-ly seating valves and means acting upon one valve tor unseat said valve, said means being further operable to successively ginseat all of said valves in order.

. 21. A double-pump hydraulic pressurey generatorhaving all valves arranged in a l all valves located in said passage, the inlet ressui'e generator c oiiii prisiiig a plurality o pumps, asingle passage.

i A: v '899,468 I v "n vertical. series and means acting upon the 'flowest'valve only to positively unseat said valve only or all of saidvalves.

22. A double-pump hydraulic pressure4 generator having a passage for the flow of liquid roiniiiiiiiicating wit i but .not including.,r the puinp-cliainbers, valves iii said pas- "sage' to normally eil'ect the flow 'ofliquid in an upward direction therethrough, and means for unseating one of said-va ves.

23. A double-pump hydraulic pressure generator having a'passalfe `for the flow of liquid communicating wit i but not including the pump-chambers, valves iii said passage to normally eiect the flow of liquid in van upward direction `therethrou h, and means for successively unseating sai valves in order from the lowest to the highest.

24. A double-pump hydraulic pressure enerator having a passa e vf or the flow of iquid comi'iiunicating wit but not including the pump-chambers, valves in said passage to normally etl'ect the flow of liquid in an upward direction therethrouo'h, and means for unseating the' lowest valve, said vmeans being further'operable to successively unseat all valves in order from tlie lowest to the highest.

25. A multiple pump hydraulic pressure generator having a Huid passage not including the pump-chambers and having Vall valves located iii said passage and downwardly seating therein, and means forcontrolling said valves.

26. A double-pump hydraulic pressure generator having a iluid passage which does not include the pump-chambers and having all valves located in said assage, the inlet port to said valves being ocated below theV outlet port therefrom when the device is a vertica position, and means for controlling said valves.

27. A double-pump hydraulic pressure'l generator having a fluid passage which does not include the pump-chambers and having outlet port therefrom when the device is in a' vertical position, .and means for unseat-ing operative to successively unseat all of said valves in order.

29, A double-pump hydraulic pressure generator having a fluid passage which do'es not include the pump-chambers and having the lowest valve, said means heilig further y port to saidvalves being located below the lowest checking back-flow from the larger outlet ort therefrom when the device is in a pump,lt l1e highest controlling back-ow from vertica position, and means acting against g the ultimate pressure chamber, and an interall of said valves. h c l smaller'pump only, anni` means for unseating 30. A hydraulic' pressure generatorcomsaid lowest valve, said means being further the lowest valve to unseat said valve onlyor i mediate valve checkinG back-ilow from the risinor two um s of different ca acities, a. i oierable to unseat more than one of said intermediate valve checking `back-flow from seating the lowest valve.

' separate valve-bore and valves therein, the

valves.

34. A hydraulic pressure generator comprising twopumps of different capacities, a. separate valve-bore and valves therein, the lowest checking back-flow from the larger pump, the highest controllingbackffiow from the ultimate pressure chamber, and an inter- 31. A hydraulic pressure4 generator commediate valve checkin back-How from the praising twov pumps of. different capacities, a smaller pump only, an( means for unseating separate valve-bore and valves therein, the lowest checking hack-How from the larger ump, the' highest controlling back-flow rom the ultimate' pressure chamber, and an the smaller pump only, and means for unoperable to "unseat all of said valves.

35. A hydraulic -pressure generator comprising two pumps of different capacities, a separate valve-bore and'valves therein, the lowest checking backilow from the larger lowest checking back-llow from the larger pump, the highest' controlling back-flow from the ultimate pressurechamber, and an interf mediate valve checkin back-flow fromthe smaller pump only, an( 'means for unseating said lowest and said intermediate valves by one operation.

32. A hydraulic pressure generator coinprising two pumps of different capacities, a separate valve-bore and valves therein, the lowest checking back-How from the larger pump, the highest controlling back-flow from the ultimate-pressure chamber, and an intermediate valve checking back-flow from the smaller pump only, and means for unseating all of said valves by one operation.

33. A hydraulic pressure generator comprising'two pumps of different capacities, a separate valve-bore and valves therein, the

JAMES W. NELSON.

Witnesses H. Cnocxnn, J As. Moonn.

pump, the highest 'controlling back-How fromsaid lowest valve, said means being further l 

